CN211370887U - Flexible hydraulic throttling speed-regulating loop experimental system - Google Patents

Abstract

The utility model discloses a flexible hydraulic throttling and speed regulating loop experimental system, which comprises an oil tank (1), a filter (2), a motor (3), a hydraulic pump (4), an overflow valve (5), throttle valves (6, 8,13,15), a hydraulic cylinder (10), a spring (12) and a plurality of sensors, wherein the components can jointly form the flexible hydraulic throttling and speed regulating loop experimental system; the multiple sensors are connected with the control system (16), and various data information in the flexible hydraulic throttling and speed regulating loop experiment system can be fed back to the display (2-3) in the control system (16) in real time and stored in the controller cabinet (2-5). Use the utility model discloses a flexible hydraulic pressure throttle speed governing return circuit experimental system can carry out the experiment in different throttle speed governing return circuits and need not to dismantle the pipeline to gather simultaneously and save experimental data, improve experimental system's efficiency and life-span.

Description

Flexible Hydraulic Throttling Speed Control Circuit Experimental System

technical field

The utility model relates to a hydraulic transmission experimental system, in particular to an experimental system of a flexible hydraulic throttling speed-regulating circuit, which belongs to the technical field of hydraulic transmission in the machinery industry.

Background technique

Hydraulic transmission technology is widely used in construction machinery and equipment. The hydraulic transmission course is a professional technical basic course for engineering majors such as automation, mechatronics engineering, mechanical engineering and its automation, and it is a highly practical course. Experimental teaching is an important practical teaching link combining theory and practice, an important teaching method for learning, understanding and mastering hydraulic theory knowledge, and an important technical means for cultivating students' practical ability and hands-on operation ability.

The throttling speed control circuit is the basic circuit in the hydraulic system and the basis for understanding and learning hydraulic control theory. The existing hydraulic throttling speed regulation experimental systems are generally scattered parts, and parts and pipelines need to be disassembled when conducting different circuit experiments, resulting in leakage of hydraulic oil, pollution of hydraulic oil and damage to parts. It causes environmental pollution in the laboratory and students are reluctant to do it because they are afraid of getting dirty, and the circuit switching time is long, resulting in a waste of time. At the same time, the existing experimental equipment lacks data acquisition and storage, and cannot quantitatively analyze the hydraulic circuit, which affects the experimental effect.

SUMMARY OF THE INVENTION

Aiming at the problems existing in the above-mentioned prior art, the utility model provides a flexible hydraulic throttle speed control circuit experiment system, using the system to conduct experiments can realize flexible switching of different throttle speed control circuits, and simultaneously perform data acquisition and storage , improve the efficiency of circuit switching, avoid pollution, improve system reliability and the quality of experimental teaching.

In order to achieve the above-mentioned purpose, the technical scheme adopted by the present utility model is: a flexible hydraulic throttle speed control circuit experimental system, including a fuel tank, a filter, an electric motor, a hydraulic pump, a relief valve, a first throttle valve, a first pressure Sensor, Second Throttle Valve, Second Pressure Sensor, Hydraulic Cylinder, Displacement Sensor, Spring, Third Throttle Valve, Third Pressure Sensor, Fourth Throttle Valve, First Flow Sensor, Second Flow Sensor, and Control System ;

The electric motor is connected to the hydraulic pump; the oil suction port of the hydraulic pump is connected to the filter, and the oil outlet is connected to the first throttle valve and the relief valve; the outlet of the first throttle valve is connected to the second throttle valve and the third throttle valve. The three throttle valves are connected, and the outlet of the second throttle valve is connected with the rodless cavity of the hydraulic cylinder; the rod cavity of the hydraulic cylinder is connected with the fuel tank after passing through the fourth throttle valve;

A first pressure sensor is installed at the outlet of the first throttle valve; a second pressure sensor is installed between the second throttle valve and the rodless cavity of the hydraulic cylinder; the rod cavity of the hydraulic cylinder is connected to the first pressure sensor. A third pressure sensor is installed between the four throttle valves;

A first flow sensor is installed between the third throttle valve and the fuel tank; a second flow sensor is installed between the overflow valve and the fuel tank;

A displacement sensor is installed on the hydraulic rod of the hydraulic cylinder.

The first pressure sensor, the second pressure sensor, the displacement sensor, the third pressure sensor, the first flow sensor and the second flow sensor are all connected to the control system.

Further, the control system includes a hydraulic power control cabinet, an experimental work platform, a display, a throttle valve control panel and a controller cabinet.

Further, the data collected during the experiment is stored in the controller in the controller cabinet, and after operation, processing and analysis are performed in the controller, the results are displayed on the display.

The utility model can carry out experiments of different throttling and speed-regulating circuits without dismantling pipelines, and collect and store experimental data at the same time, which improves the efficiency of switching between different circuits during the experiment, avoids the leakage of hydraulic oil and improves the performance of the experimental system. life.

The throttling speed regulation of the utility model can compare and analyze the speed conditions under different loads, and at the same time, through the fusion of sensors, comprehensive system analysis and research can be carried out. Transmission efficiency, load characteristics, etc.

Description of drawings

Fig. 1 is the principle schematic diagram of the hydraulic system of the present utility model;

Fig. 2 is the layout diagram of the experimental system of the present utility model;

3 is a schematic diagram of the throttle valve adjustment panel of the present invention;

Fig. 4 is the test curve display interface diagram of the present utility model;

In the figure, 1. Fuel tank, 2. Filter, 3. Electric motor, 4. Hydraulic pump, 5. Relief valve, 6. First throttle valve, 7. First pressure sensor, 8. Second throttle valve, 9. Second pressure sensor, 10. Hydraulic cylinder, 11. Displacement sensor, 12. Spring, 13. Third throttle valve, 14. Third pressure sensor, 15. Fourth throttle valve, 16. Control system, 17 .First flow sensor, 18. Second flow sensor, 2-1. Hydraulic power control cabinet, 2-2. Experimental work platform, 2-3. Display, 2-4. Throttle valve control panel, 2-5 .Controller cabinet box, 3-1. Throttle valve control button, 4-1. Hydraulic cylinder position curve, 4-2. Hydraulic cylinder speed curve, 4-3 Circuit efficiency curve.

Detailed ways

The present utility model will be described in further detail below in conjunction with the accompanying drawings.

As shown in Figure 1, a flexible hydraulic throttle speed control circuit experimental system includes a fuel tank 1, a filter 2, a motor 3, a hydraulic pump 4, a relief valve 5, a first throttle valve 6, and a first pressure sensor 7 , second throttle valve 8, second pressure sensor 9, hydraulic cylinder 10, displacement sensor 11, spring 12, third throttle valve 13, third pressure sensor 14, fourth throttle valve 15, first flow sensor 17 , the second flow sensor 18, and the control system 16, and all the above components can be combined into a flexible hydraulic throttle speed control loop experimental system;

The motor 3 is connected to the hydraulic pump 4; the oil suction port of the hydraulic pump 4 is connected to the filter 2, and its oil outlet is connected to the first throttle valve 6 and the relief valve 5; the outlet of the first throttle valve 6 is connected to the filter 2. The second throttle valve 8 is connected to the third throttle valve 13 , and the outlet of the second throttle valve 8 is connected to the rodless cavity of the hydraulic cylinder 10 ; connected to the fuel tank;

A first pressure sensor 7 is installed at the outlet of the first throttle valve 6; a second pressure sensor 9 is installed between the second throttle valve 8 and the rodless cavity of the hydraulic cylinder 10; the hydraulic cylinder 10 A third pressure sensor 14 is installed between the rod cavity and the fourth throttle valve 15;

A first flow sensor 17 is installed between the third throttle valve 13 and the oil tank 1; a second flow sensor 18 is installed between the overflow valve 5 and the oil tank 1;

A displacement sensor 11 is installed on the hydraulic rod of the hydraulic cylinder 10 .

The first pressure sensor 7 , the second pressure sensor 9 , the displacement sensor 11 , the third pressure sensor 14 , the first flow sensor 17 and the second flow sensor 18 are all connected to the control system 16 .

As shown in FIG. 2 and FIG. 3 , the control system 16 includes a hydraulic power control cabinet 2-1, an experimental work platform 2-2, a display 2-3, a throttle valve control panel 2-4 and a controller cabinet 2 -5, the throttle control panel 2-4 also has 4 throttle control buttons 3-1.

As shown in Figure 4, the data collected during the experiment is stored in the controller, and is calculated, processed and analyzed in the controller, and then drawn into a curve map, such as the data measured by the displacement sensor, after processing and analysis The drawn hydraulic cylinder position curve 4-1 and hydraulic cylinder speed curve 4-2, as well as the data measured by the coordination of various sensors, and the loop efficiency curve 4-3 drawn after processing and analysis, etc.

When conducting the variable pressure outlet throttling speed control circuit experiment, the size of the spring 12 and the opening pressure of the relief valve 5 are set at the same time (the relief valve 5 is not opened at this time), and the outlet pressure of the hydraulic pump 4 increases with the spring compression. And rise; at this time, the outlet pressure of the hydraulic pump 4 is changing, and the reading of the second flow sensor 18 is zero. The reading of the first flow sensor 17 is inversely proportional to the speed of the hydraulic cylinder 10 . The control of the speed of the hydraulic cylinder 10 is achieved by adjusting the fourth throttle valve 15 . When the opening size of the fourth throttle valve 15 is fixed, as the compression amount of the spring 12 increases, the speed of the hydraulic cylinder 10 will decrease.

When performing the variable pressure inlet throttle speed regulation circuit experiment, the size of the spring 12 and the opening pressure of the relief valve 5 are set at the same time (the relief valve 5 is not opened at this time), and the outlet pressure of the hydraulic pump 4 increases with the spring compression. Large and rising; at this time, the outlet pressure of the hydraulic pump 4 is changing. The reading of the second flow sensor 18 is zero. The reading of the first flow sensor 17 is inversely proportional to the speed of the hydraulic cylinder 10 . The control of the speed of the hydraulic cylinder 10 is achieved by adjusting the second throttle valve 8 . When the opening size of the second throttle valve 8 is fixed, the speed of the hydraulic cylinder 10 decreases as the compression amount of the spring 12 increases.

When carrying out the constant pressure outlet throttle speed regulation circuit experiment, close the third throttle valve 13, and set the size of the spring 12 and the opening pressure of the relief valve 5 at the same time. At this time, the relief valve 5 is opened, and the outlet pressure of the hydraulic pump 4 is basically Equal to the set pressure of the relief valve 5, the outlet pressure of the hydraulic pump 4 is substantially constant. The reading of the first flow sensor 17 is zero. The reading of the second flow sensor 18 is inversely proportional to the speed of the hydraulic cylinder 10 . The control of the speed of the hydraulic cylinder 10 is achieved by adjusting the fourth throttle valve 15 . When the opening size of the fourth throttle valve 15 is fixed, as the compression amount of the spring 12 increases, the speed of the hydraulic cylinder 10 will decrease.

When carrying out the constant pressure inlet throttle speed regulation loop experiment, close the third throttle valve 13, and set the size of the spring 12 and the opening pressure of the relief valve 5 at the same time. At this time, the relief valve 5 is opened, and the outlet pressure of the hydraulic pump 4 is basically Equal to the set pressure of the relief valve 5, the outlet pressure of the hydraulic pump 4 is substantially constant. The reading of the first flow sensor 17 is zero. The reading of the second flow sensor 18 is inversely proportional to the speed of the hydraulic cylinder 10 . The control of the speed of the hydraulic cylinder 10 is achieved by adjusting the second throttle valve 8 . When the opening size of the second throttle valve 8 is fixed, the speed of the hydraulic cylinder 10 will decrease with the increase of the contraction amount of the spring pressure 12 .

In several speed control loops, the calculation of the efficiency of the transmission loop can be carried out through the readings of the sensors. The position and speed of the hydraulic cylinder can be displayed in the control system. It can intuitively reflect the speed control characteristics of the throttle speed control circuit. That is, as the load increases, the speed of the hydraulic cylinder will decrease, that is, the load characteristic of throttle speed regulation is softer.

In order to improve the load characteristics of throttle speed control, the speed control characteristics of the fixed-difference pressure reduction speed control valve can be simulated during the experiment of the throttle-in speed control loop. At this time, the third throttle valve 13 is closed, and the size of the spring 12 and the opening pressure of the relief valve 5 are set at the same time. At this time, the relief valve 5 is opened, and the outlet pressure of the hydraulic pump 4 is basically equal to the set pressure of the relief valve 5. The outlet pressure of the hydraulic pump 4 is substantially constant. The reading of the first flow sensor 17 is zero. The reading of the second flow sensor 18 is inversely proportional to the speed of the hydraulic cylinder 10 . The opening size of the second throttle valve 8 is fixed, and the pressure difference of the second throttle valve 8 is basically constant by adjusting the opening size of the first throttle valve 6, that is, the speed of the hydraulic cylinder 5 is basically constant, and the The pressure is increased and the speed is lower, realizing the speed control performance of the fixed-difference speed control valve.

In order to improve the load characteristics of throttle speed control, the speed control characteristics of the three-way flow valve can be simulated during the experiment of the throttle-in speed control loop. At this time, the first throttle valve 6 is fully opened, and the size of the spring 12 and the opening pressure of the relief valve 5 are set. At this time, the relief valve 5 is not opened, and the outlet pressure of the hydraulic pump 4 changes with the load. The reading of the first flow sensor 17 is zero. The reading of the second flow sensor 18 is inversely proportional to the speed of the hydraulic cylinder 10 . The opening size of the second throttle valve 8 is fixed, and the pressure difference of the second throttle valve 8 is basically constant by adjusting the opening size of the third throttle valve 13, so that the speed of the hydraulic cylinder 10 can be basically constant, and the The pressure increases and decreases, and the speed control performance experiment of the three-way speed control valve is realized.

Claims (3)

1. A flexible hydraulic throttling and speed regulating loop experimental system comprises an oil tank (1), a filter (2), a motor (3), a hydraulic pump (4), an overflow valve (5), a first throttling valve (6), a first pressure sensor (7), a second throttling valve (8), a second pressure sensor (9), a hydraulic cylinder (10), a displacement sensor (11), a spring (12), a third throttling valve (13), a third pressure sensor (14), a fourth throttling valve (15), a first flow sensor (17) and a second flow sensor (18), and is characterized by further comprising a control system (16);

the motor (3) is connected with a hydraulic pump (4); an oil suction port of the hydraulic pump (4) is connected with the filter (2), and an oil outlet of the hydraulic pump is connected with the first throttling valve (6) and the overflow valve (5); the outlet of the first throttle valve (6) is connected with a second throttle valve (8) and a third throttle valve (13), and the outlet of the second throttle valve (8) is connected with a rodless cavity of the hydraulic cylinder (10); a rod cavity of the hydraulic cylinder (10) is connected with an oil tank through a fourth throttle valve (15);

a first pressure sensor (7) is arranged at the outlet of the first throttling valve (6); a second pressure sensor (9) is arranged between the second throttle valve (8) and a rodless cavity of the hydraulic cylinder (10); a third pressure sensor (14) is arranged between a rod cavity of the hydraulic cylinder (10) and a fourth throttle valve (15);

a first flow sensor (17) is arranged between the third throttle valve (13) and the oil tank (1); a second flow sensor (18) is arranged between the overflow valve (5) and the oil tank (1);

a displacement sensor (11) is arranged on a hydraulic rod of the hydraulic cylinder (10);

the first pressure sensor (7), the second pressure sensor (9), the displacement sensor (11), the third pressure sensor (14), the first flow sensor (17) and the second flow sensor (18) are all connected with a control system (16).

2. The experiment system of the flexible hydraulic throttling governing loop according to claim 1, characterized in that the control system (16) comprises a hydraulic power control cabinet (2-1), an experiment working platform (2-2), a display (2-3), a throttle control panel (2-4) and a controller cabinet (2-5).

3. The experiment system of the flexible hydraulic throttling governing loop according to claim 1 or 2, characterized in that, the data collected in the experiment process are stored in the controller cabinet (2-5), and after calculation, processing and analysis are carried out in the controller, the results are displayed by the display (2-3).

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